Neck Mass

Neck mass classification — benign and malignant

Neck masses fall into two main categories: benign and malignant. Benign causes include reactive lymphadenopathy (following upper respiratory infection), branchial cleft cyst (a congenital lateral neck cyst), thyroglossal duct cyst (midline), lipoma, dermoid cyst, and lymphangioma.

Malignant masses fall into three groups: metastatic squamous cell carcinoma (from mouth, throat, larynx, or nasopharynx), lymphoma (Hodgkin and non-Hodgkin), and primary thyroid cancer. Less commonly, distant metastasis from breast, lung, or gastrointestinal malignancy may present as a neck mass.

Localisation guides the diagnosis: midline masses are thyroglossal or thyroid in origin; anterior triangle masses are most often lymphatic or branchial; posterior triangle masses are more suspicious for lymphoma or metastasis.

The Rule of 80s and alarm signs

The Rule of 80s widely used in clinical practice states: in adults over 40, 80% of lateral neck masses are malignant; 80% of those are metastatic carcinoma; and 80% of metastatic cancers originate from a primary tumour in the head and neck region. This rule summarises why systematic investigation is mandatory.

Alarm signs include: a mass present for more than 3 weeks, progressive growth, hardness or fixation to surrounding tissues, painlessness (painful masses are more often infectious or inflammatory), hoarseness (recurrent laryngeal nerve compression), dysphagia (oesophageal or hypopharyngeal involvement), haemoptysis (lung metastasis or primary tumour), unexplained weight loss, and night sweats.

In children the rule reverses: in individuals under 40 (especially children), the vast majority of neck masses are reactive lymphadenopathies. However, childhood masses larger than 2 cm, present for more than 3 weeks, or growing may also require biopsy.

Diagnostic workup — FNA, ultrasound, and CT

Fine needle aspiration cytology (FNAC/FNA) is the first-line biopsy method for a neck mass. Ultrasound-guided FNA improves accuracy. This minimally invasive technique carries no tumour seeding risk compared with open biopsy; however, excisional biopsy may be required in cases of cytological inadequacy or lymphoma suspicion.

Neck ultrasonography shows the size, cystic or solid nature, vascularity, and relationship to surrounding tissues of the mass. In suspicious lymph nodes (round shape, loss of hilum, necrosis, peripheral vascularity), it is an early indicator of malignancy.

Contrast-enhanced neck CT and PET-CT assess regional spread, vascular invasion, and distant metastasis. In cancers of unknown primary, PET-CT can identify the primary focus in 60–70% of cases. MRI is particularly useful for clarifying soft-tissue invasion and skull base involvement.

Treatment options by diagnosis

Reactive lymphadenopathy and infection: treatment of the primary infection (antibiotics, antivirals). If it persists beyond two weeks or continues to grow, further investigation is mandatory. A hidden source such as periodontal infection or tonsillitis is sought.

Congenital cysts (branchial cleft, thyroglossal duct): the standard treatment is surgical excision. For thyroglossal cysts the Sistrunk procedure is used (includes the mid-segment of the hyoid bone). For infected cysts: drainage first, then elective surgery after 6–8 weeks.

Metastatic squamous cell carcinoma and lymphoma: once the primary focus is identified, the decision is made by the multidisciplinary tumour board. Neck dissection, radiotherapy, and chemotherapy are combined according to the individual case. In neck metastasis of unknown primary, evaluation at an experienced centre is critical — Prof. Dr. Özdoğan applies a comprehensive protocol of systematic FNA, panendoscopy, and PET-CT for these patients.

Frequently Asked Questions

• When should I see a doctor about a neck swelling?+
  See an ENT specialist for any neck mass that has been present for more than two weeks, is growing, or is hard. If additional symptoms are present (hoarseness, swallowing difficulty, weight loss), urgent evaluation is needed.
• Is FNA (fine needle) biopsy painful?+
• Can I tell from an ultrasound whether a neck mass is malignant?+
• Can a thyroglossal cyst recur?+
• If I need surgery for a neck mass, what does the process look like?+

References

• AAO-HNSPynnonen MA et al. Clinical Practice Guideline: Evaluation of the Neck Mass in Adults. Otolaryngol Head Neck Surg. 2017;157(2_suppl):S1-S30.
• PubMedMehanna H et al. Head and neck cancer — Part 1: Epidemiology, presentation, and prevention. BMJ. 2010;341:c4684.
• NCCNNCCN Clinical Practice Guidelines in Oncology: Head and Neck Cancers — Occult Primary